Indian Evidence Act, 1872
In order to corroborate the testimony of a witness, any former statement made by such witness relating to the same fact, at or about the time when the fact took place, or before any authority legally competent to investigate the fact, may be proved. 158. What matters may be proved in connection with proved statement relevant under section 32 or 33. ––Whenever any statement, relevant under section 32 or 33, is proved, all matters may be proved either in order to contradict or to corroborate it, or in order to impeach or confirm the credit of the person by whom it was made, which might have been proved if that person had been called as a witness and had denied upon cross-examination the truth of the matter suggested.